OFFSET
0,3
LINKS
Paul D. Hanna, Table of n, a(n) for n = 0..200
EXAMPLE
G.f.: A(x) = 1 + x + 2*x^2 + 5*x^3 + 16*x^4 + 60*x^5 + 248*x^6 +...
The g.f. satisfies:
A(x) = 1 + x/(1-x*A(x)) + x^2/(1-x*A(x)^2)^2 + x^3/(1-x*A(x)^3)^3 +...
PROG
(PARI) {a(n)=local(A=1+x); for(i=1, n, A=1+sum(m=1, n, x^m/(1-x*(A+x*O(x^n))^m)^m)); polcoeff(A, n)}
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Mar 01 2011
STATUS
approved